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| author |   Logan Gunthorpe <logang@deltatee.com> | 2019-08-12 11:30:48 -0600 |
|---|---|---|
| committer |   Bjorn Helgaas <bhelgaas@google.com> | 2019-08-16 08:41:59 -0500 |
| commit | 27235b15e4197b3a1014cf0ca0b08dbbf61a692b (patch) | |
| tree | 6c148c772a128518380a5dfc90c800b1c4e2856b /drivers/pci/p2pdma.c | |
| parent | PCI/P2PDMA: Allow IOMMU for host bridge whitelist (diff) | |
| download | linux-dev-27235b15e4197b3a1014cf0ca0b08dbbf61a692b.tar.xz linux-dev-27235b15e4197b3a1014cf0ca0b08dbbf61a692b.zip | |
PCI/P2PDMA: Update pci_p2pdma_distance_many() documentation
The comment describing pci_p2pdma_distance_many() still referred to
the devices being behind the same root port. This no longer applies
so reword the documentation.
Link: https://lore.kernel.org/r/20190730163545.4915-15-logang@deltatee.com
Link: https://lore.kernel.org/r/20190812173048.9186-15-logang@deltatee.com
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/pci/p2pdma.c')
| -rw-r--r-- | drivers/pci/p2pdma.c | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/drivers/pci/p2pdma.c b/drivers/pci/p2pdma.c index d8c824097d26..0608aae72ccc 100644 --- a/drivers/pci/p2pdma.c +++ b/drivers/pci/p2pdma.c @@ -517,15 +517,14 @@ upstream_bridge_distance_warn(struct pci_dev *provider, struct pci_dev *client, * @num_clients: number of clients in the array * @verbose: if true, print warnings for devices when we return -1 * - * Returns -1 if any of the clients are not compatible (behind the same - * root port as the provider), otherwise returns a positive number where - * a lower number is the preferable choice. (If there's one client - * that's the same as the provider it will return 0, which is best choice). + * Returns -1 if any of the clients are not compatible, otherwise returns a + * positive number where a lower number is the preferable choice. (If there's + * one client that's the same as the provider it will return 0, which is best + * choice). * - * For now, "compatible" means the provider and the clients are all behind - * the same PCI root port. This cuts out cases that may work but is safest - * for the user. Future work can expand this to white-list root complexes that - * can safely forward between each ports. + * "compatible" means the provider and the clients are either all behind + * the same PCI root port or the host bridges connected to each of the devices + * are listed in the 'pci_p2pdma_whitelist'. */ int pci_p2pdma_distance_many(struct pci_dev *provider, struct device **clients, int num_clients, bool verbose) |